Electric drill or hammer



April 15 1924. 1,490,276

A. D. KENYON v ELECTRIC n DRILL OR HAMMER 4i5 1924- 1,490,276 f A. D.KENYON ELECTRIC DRILL OR HAMMER Filed dan. 14 19?? y 2 Sheets-8heelPatented Apr. 15, 1924.

UNITED STATES PATENT OFFICE.

ARTHUR DOUGLAS KENYON, O'F DENVER, COLORADO, ASSIGNOR TO GENERAL IA-CHINERY & SUPPLYCOMPANY, OF DENVER, COLORADO.

ELECTRIC DRILL OR HAMMER.

Application med January 14, 1922. semi No. 529395.

To all, w/mm it may concer/i.'

Beit known that I, ARTHUR D. KENYON,

a citizen otl the United States, residin at Denver, in the county ofDenver and tate ot Colorado, have invented a new and useful ElectricDrill or Hammer, of which the following is a specification.

The device forming the subject matter of this invention is a hammer ordrill, the reciprocating core of which moves responsive to solenoidmagnets, and the invention aims to provide novel means for energizingand deenergizing the solenoid magnets automatically, through theinstrumentality of the reciprocating core. Another object of the'invention is to provide novel means whereby the operation of the toolmay be stopped and started at will.

It is within the province of the disclosure to improve generally and toenhance the utility of devices of that type to which the inventionappertains.

With the above and other objects in view, which will appear as thedescriptiony proceeds, the invention resides in the combination andarrangement ot' parts and in the details of construction hereinafterdescribed and claimed, it being understood that, within the scope ofwhat is claimed, changes in the precise embodiment of the inventionshown can be made without departing from the spirit of the invention.

In the accompanying drawings:-

Figure 1 shows in longitudinal section, a device constructed inaccordance with the invention, parts being broken away; Figure 2 is asection on the line 2-2 of Figure 1; Figure 3 is an end elevation.

In carrying out the invention there is provided a frame 1 including ahead 2 carrying a handle 3. A tubular body 4 is connected by threadingor otherwise, as indicated at 5, with the head 2, and includes an endwall 6 having a boss 7. An inner tubular guide 8 is bound between theboss 7 and the head 2, the boss and the head having recesses 9 for thereception of the ends of the guide 8. The numeral 10 marks an outerguide which is threaded as indicated at 11, upon, or secured otherwiseto, the bcss 7. The have shoulders 12. A tappet 14 is mounted forreciprocation in the guide-10 and has a head 15 adapted to cooperatewith guide 10 and the boss 7 the shoulders 12 to limit the movement ofthe tappet.

An outer solenoid 16 is located in the body ,4, about the inner guide 8and is lorated adj arent to the end wall 6. An inner solenoid 17 isdisposed Within the body 4 about the guide 8 and is located adjacent tothe head 2. The device includes a core adapted to move responsive to thesolenoids 16 and 17. The core comprises a body 18, slidable in the guide48, and a reduced stem 19, passing through an opening 29 in the part 2,the stem havinga head 20 at its outer end.

Ears 21 project inwardly from one side portion of the handle 3. Thenumeral 22 marks a switch member provided at its ends with projections23 and 230. The switch member has a flange 24, received between the ears21, and connected thereto by a pivot element 25. A contact 26 is mountedon one end of the switch member 22 and is insulated therefrom. Thecontact 26 is adapted to cooperate with a. contact`27 carried by aspring tongue 28, secured to one of the ears 21 and insulated therefrom.

A slot 30 is formed in the handle 3, one end of a link 31 extending intothe slot, the said end of the link being carried by a pivot element 32mounted in the handle 3. A lever 33 extendsthrough the slot 30 and isfulcrumed intermediate its ends on a pivot element 34 mounted in thelhandle 3. The numeral 35 designates a connection, preferably in theform of a bar, the ends of the connection 35 being pivoted at 36 to theinner ends of the lever 33 and the link 31. A switch .member 37 isprovided, and is equipped with projections 38 and 39. The

switch member 37 has a. yflange 40, pivoted at 41 to the connection 35.`A contact 42 is mounted on one end of the switch member 37 and isinsulated therefrom, the said contact being adapted to cooperate with acontact 43 carried by a spring tongue. 44 mounted on a finger 45pro'ecting inwardly from one side portion of t e handle 3,A the springtongue being insulated from the finend of the lunger 47 cooperates. Aslot solenoid 16 is energized, whereupon the core 49 is formed) in thehandle 3, the plunger 18-19 will move downwardly.

47 having a pin 50, mounted to move in the slot, these elementscooperating to limit the sliding movement of the plunger 47. At itsouter end, the plunger 47 carries a head 51. A compression spring 52surrounds a portion of the plunger 47 and is interposed between the head51 on the plunger and an abutment 53 on the handle 3.

The tubular bod 4 carries a binding post 54. One end 55 o the winding ofthe outer solenoid 16 is connected to the bindin post 54. One end 56 ofthe'winding of t 1e inner solenoid 17 is connected to the binding post54. A conductor 57 is likewise connected to the binding post 54. Theother end 58 of the winding of the solenoid 16 is connected to thecontact 42 on the pivotally mounted switch member 37. The correspendingend 63 of the winding of the solenoid 17 1s connected to the contact 27on the s ring ton 1e 28. A' conductor 61 connects the contac 26 on thepivotally mounted switch member 22 with a binding post 60 on the head 2.A conductor 59 connects the binding post 60 with the contact 43 on thespring tongue 44. A conductor 62 is connected to the binding post 60.

For convenience in setting forth the operation of the tool let twocircuits be traced out at this point, these circuits being designated ascircuit A and circuit B.

Circuit A includes a conductor 62, the post 60, the conductor 59, thecontact 43 the contact 42, the end 58 of the winding oi the solenoid 16,the winding of the solenoid 16, the end 55 of the windin of the solenoid16, the bindin post 54, an the conductor 57.

Circuit includes the conductor 62, the post 60, the conductor 61, thecontact 26 the contact`27 the end 63 of the winding of the solenoid 17,the windin of the solenoid 17, the end 56 of the-win 'ng of the solenoid17 the post 54, and the conductor 57.

iF or convenience, let it be supposed that the tool is held vertically,reference being had to Fi re 1, the terms upwardly and downwardlsj7u andthe like, being selected accordingly.

Referring to Figure 1, the core.18-19 may be considered to have moved uwardly, responsive to the solenoid 17. en the core has arrived in the,position shown in Figure 1, the head 20 on the stem 19 of the coreengages the projection 23 on the switch member 22, the switch member 22being tilted on its fulcrum` 25, the contact 26 being spaced from thecontact 27, circuit B being open and the solenoid 17 being deenergized.The head 2O on the stem 19 enga s the projection 28 on the switch memr37, the switch member 37 tilting on its fulcrum 41, and the contact 42being closed on the contact 43. Circuit A now is closed, and the 'todrop downwardly,- 1

Then the core 19 moves downwardly, the head 20 engages the projection,230 on the switch member 22, the switch member 22 tilts on its fulcrum25, the Contact 26 is brought. into engagement with the contact 27, andthe solenoid 17 is energized, at the time that the core 18-19 arrives atthe limit of its downward stroke. Simultaneously, the head 20 engagesthe projection 39`on the switch member 37, tilting the switch" member onits fulcrum 41, the contact 42 being s aced from the contact 43, and thesolenoi 16 being deenergized. The core then moves upwardly, responsiveto the action of the solenoid 17.

As is well undestood in the art, the body portion 18 of the core coactswith the tappet 14 to impart reciprocation thereto.

When the plunger 47 is thrust downwardl as shown 1n Figure 1, the lever33 and t e link 31 are tilted, and the connection 40 carries the switchmember 37 inwardly, so that its projections 38 and 39 lie in the ath ofthe head 20 on the core. When, 1owever,.- ressure on the head 51 oftheplunger 47 is released, the spr' 52 reacts, withdrawing the. plu er 47,5 permitting the lever v33 and t e link 81 the switch member 37 thusbeing dispose its projections 38 and 39 are out of the path of the head.20. The o rator, in view of the fore oin has wit 'n his control a meansw ere y the o ration of the tool may be stop at wil at is aimed is:

1. In a tool of the class described, l frame; solenoids carried thereby;a core movable in op ite directions responsive to the solenol s;tiltable switch members supported on the frame and interposed in thecircuits of the solenoids, the switch members being located in the athof the core, to be operated thereby, an means under the control of theoperator for raising one switch member to operative position.

2.'In a tool of the class described, a frame solenoids carried thereby;a cone movable in opposite directions responsive to the solenoids;tiltable switch members su ported on the frame and interposed in tigecircuits of the solenoids, the switch members being engageable by thecore to be operated thereby; means under the control of an operator formoving one switch member into the path tra-versed by the core.

43. In a tool of the class described, a frame; solenoids carriedthereby; a core movable in opposite directions responsive to thesolenoids; switch members pivotally supported on the frame intermediatetheir ends, each switch member being provided at both ends withprojections located in the n such a position that path traversedby thecore, the switch members being provided at o posife ends with means foropening and c osing the circuits of the respective solenoids.-

4. In a tool of the class described, a.

the core; a second switch member inlever fulcrumed on the frame; meansfor mounting the second Switch member for pivotal movement on the lever,the lever constituting means for movin the switch member into the pathtraverse by the core; and means under the control of an operator foractuating the lever.

In testimony that I claim the foregoing as my own, I have hereto aixedmy signature in the ART Witnesses: v

HENRY FRANCIS Cnosn, l J. E. NmoN.

resenoe of two Witnesses.-- UR DOUGLAS KENYON.

